W29C040P-90 Ver la hoja de datos (PDF) - Winbond

Número de pieza

componentes Descripción

Fabricante

W29C040P-90

512K ·8 CMOS FLASH MEMORY

Winbond 

W29C040

Command Codes for Software Data Protection

BYTE SEQUENCE

0 Write

1 Write

2 Write

3 Write

4 Write

5 Write

TO ENABLE PROTECTION

ADDRESS

DATA

5555H

AAH

2AAAH

55H

5555H

A0H

-

-

-

-

-

-

Software Data Protection Acquisition Flow

Software Data Protection

Enable Flow

Load data AA

to

address 5555

TO DISABLE PROTECTION

ADDRESS

DATA

5555H

AAH

2AAAH

55H

5555H

80H

5555H

AAH

2AAAH

55H

5555H

20H

Software Data Protection

Disable Flow

Load data AA

to

address 5555

Load data 55

to

address 2AAA

Load data 55

to

address 2AAA

Load data A0

to

address 5555

Load data 80

to

address 5555

(Optional page-load

operation)

Sequentially load

up to 256 bytes

of page data

W ait for 10 mS or

toggle/polling

completed

Exit

Load data AA

to

address 5555

Load data 55

to

address 2AAA

Load data 20

to

address 5555

Notes for software program code:

Data Format: DQ7 − DQ0 (Hex)

Address Format: A14 − A0 (Hex)

-6-

W ait for 10 mS

Exit

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